Rubber laminate and flexible hose using same

Abstract

A non-crosslinked rubber laminate which is a rubber laminate includes a butyl rubber-containing layer stacked with an ethylene propylene diene rubber and/or ethylene propylene rubber-containing layer, wherein such non-crosslinked rubber laminate is characterized in that the ethylene propylene diene rubber and/or ethylene propylene rubber-containing layer is a rubber-containing layer that contains a low-molecular-weight polyolefin, a phenolic resin, and a crosslinking agent, where: the low-molecular-weight polyolefin is contained by 40 to 70 parts by weight, the phenolic resin is contained by 1 to 4 parts by weight, and the crosslinking agent is contained by at least 1 part by weight, relative to the ethylene propylene diene rubber and/or ethylene propylene rubber constituting a total of 100 parts by weight. An air conditioning hose made of the rubber laminate, for example, can accommodate POE-based lubricating oils and retain vibration absorption characteristics.

What is claimed is: 
     
       1. A non-crosslinked rubber laminate which is a rubber laminate comprising a butyl rubber-containing layer stacked with an ethylene propylene diene rubber and/or ethylene propylene rubber-containing layer, said non-crosslinked rubber laminate characterized in that the ethylene propylene diene rubber and/or ethylene propylene rubber-containing layer is a rubber-containing layer that contains a low-molecular-weight polyolefin, a phenolic resin, and a crosslinking agent, where:
 the low-molecular-weight polyolefin has a number-average molecular weight of 300 to 4000 and is contained by 40 to 70 parts by weight, 
 the phenolic resin is contained by 1 to 4 parts by weight, and 
 the crosslinking agent is contained by at least 1 part by weight, 
 relative to the ethylene propylene diene rubber and/or ethylene propylene rubber constituting a total of 100 parts by weight. 
 
     
     
       2. The non-crosslinked rubber laminate according to  claim 1 , characterized in that the low-molecular-weight polyolefin is a polybutene, and the crosslinking agent is an organic peroxide. 
     
     
       3. A crosslinked rubber laminate which is a rubber laminate comprising a butyl rubber-containing layer stacked with an ethylene propylene diene rubber and/or ethylene propylene rubber-containing layer, said crosslinked rubber laminate characterized in that the ethylene propylene diene rubber and/or ethylene propylene rubber-containing layer is a rubber-containing layer that contains a low-molecular-weight polyolefin and a phenolic resin, and has been crosslinked by a peroxide, where:
 the low-molecular-weight polyolefin has a number-average molecular weight of 300 to 4000 and is contained by 40 to 70 parts by weight, and 
 the phenolic resin is contained by 1 to 4 parts by weight, 
 relative to the ethylene propylene diene rubber and/or ethylene propylene rubber constituting a total of 100 parts by weight; and 
 the butyl rubber-containing layer is crosslinked and bonded with the ethylene propylene diene rubber and/or ethylene propylene rubber-containing layer. 
 
     
     
       4. The flexible hose characterized in that it has a structure of the rubber laminate according to  claim 3 . 
     
     
       5. The flexible hose according to  claim 4 , characterized in that:
 an innermost layer side of the flexible hose is constituted by the ethylene propylene diene rubber and/or ethylene propylene rubber-containing layer; 
 a thickness of the butyl rubber-containing layer is 1.1 mm or more; and 
 a thickness of the butyl rubber-containing layer is at least 1.4 times a thickness of the ethylene propylene diene rubber and/or ethylene propylene rubber-containing layer.